Case 648 update 3. The work continues!

Today we continue work on the 648. Started to clean up the gas tank and found a couple of holes in the bottom. A good friend of ours was able to patch it.

We tested it and had no leaks! Next order of business was the bad tire. Its completely rotten. Wont stay on the rim.

The old one came right off the new one was a bit of a pain. But we eventually got it on the rim and aired up.

Since the gas tank was out of the way we decided to check out the rear end.

The picture doesnt show it but I do have cribbing under the tractor to brace it. The differential cover bolts also hole the transaxle on the machine so I wanted to be sure nothing could move.

The outside looked so rough, I didnt hold much hope for what we would find on the inside. I expected an 80WT milkshake for sure! To my surprise someone had been in the rear end before us. It looked great! No chipped gear teeth, no water, good bolts holding the differential together!

So we changed the oil, cleaned all the surfaces and closed it up. I spray painted the the patch on the tank and the differential cover since there no access to them with the tractor assembled. We reassembled it with a different operators seat. The original was falling apart. This is the first time this machine has sat on 4 aired up tires in who knows how long! I decided to try to move it into the shop for tonight since they are calling for storms here overnight.

This is the first time its really moved under its own power in at least 10 years! But it still has some issues. It can hardly move when in high. I was able to drive it on flat ground and maneuver in the shop with it in low. I really didnt like having to leave the bucket up like that but its the only way I could get the garage door shut for the night. Thats why I have the pipe under it to hold it up just in case. The tractor is driven with a hydraulic motor. The oil in the system is low and looks milky. I think the next item will be to drain the hydraulic system and get some good oil in it and a new filter. If that doesnt help I guess the only other thing to do is to try to adjust the linkages. That where we stand tonight. Everything seems to moving along. Anybody got some good tips on draining this system drained? As alway thanks for your comments and thoughts, we appreciate it!

Just in case you don't know...the hydraulic system uses 15/40 diesel engine oil. Rotella or another brand. Hydraulic oil will be too thin.

Yes I do have 15/40 to go in it. Im hoping thats the issue with the drive motor. The oil thats on it now has water in it. Thanks.

Great progress! Cut yourself a couple of pieces of angle iron for cylinder props.

Lookin good so far! Nice to see someone either kept it inside all the time, or actually serviced the rear this century...

There's a procedure in one of the manuals, either the owner's, or the hydraulic service manual that discusses how to drain the whole system. It's a royal pain. You have to break off all the cylinders to ensure you get all the oil out.

The other option is to dump what you can, either by the return line, or the test port on the control valve, and then refill, circulate, etc...

These machine are never real strong in high range, but it should be fine on the flat. Both mine ended up needing the pump replaced. It was a crappy job, but it was well worth it. I would expect the pump to be bad before the drive motor. The hoe, and loader need so little flow in comparison to the drive that it will seem like the system is fine, and the motor is shot, but it's almost always the pump.

Blackhole49.

Thanks! Thats a good idea. Im not sure where its going to live around here yet. Hopefully I wont have the bucket up like that

See how it is after you refill it with the proper oil.

From personal experience I can say it is a night and day difference how it will operate with the wrong oil in it.

I purchased a 400 series for next to nothing years ago because the owner had convinced himself that he needed a new pump and or drive motor, I changed the oil and it functioned like new.

Take a flashlight and have a good look inside the hydraulic tank.
I had another that would intermittently fall flat on it's face power wise, turned out somebody (kids?) had dropped a rock into the tank. Once in a while it would end up over the hole that the feed line to pump attaches and severely restrict the flow.

Last thought I did have one that the drive motor was faulty, going by memory from 25+ years ago I believe it had a wear plate inside the motor that I was able to flip over and bring it back to life.
All of the above is from my experience on the 200 and 400 series I have not owned a 600 series.

Tslinger

I was sure happy to see the rear end had been gone
through! I need to go back to my last post and get that
link you sent me. I can see the layout of the system in the
parts book. The owner manual just says to drain it from
the plug on the control valve. That seem like it would take
a long time and leave a lot of oil in the system. Hopefully
the hydraulic service manual is part of that link. The issue
is the way you describe it. The hoe and loader seem to be
functioning fine. The machine is just slow to move. Im
glad you said that because my mind was going to the
drive motor as the problem. It need an oil change so Ill
try that first. Thanks!

Determined

Id have to assume the 600 series has similar
components as the others but I dont know that for a fact.
I appreciate your insight. Ill definitely be inspecting the
tank. Im hoping getting good oil in it will make the
difference. Thank you!

(quoted from post at 06:47:30 04/11/22) Today we continue work on the 648. Started to clean up the gas tank and found a couple of holes in the bottom. A good friend of ours was able to patch it.
<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto122792.jpg>

Click to expand...

Your friend may have a welder, but he's not a welder.

Ozlander

LoL. Neither am I! Im just glad it doesnt leak!